<?php
$str='s:664:"cmd=_notify-validate&max_number_of_payments=1&starting_date=2011-09-07T00%3A00%3A40.000-07%3A00&pin_type=NOT_REQUIRED&currency_code=USD&sender_email=david2_1315191784_per%40163.com&verify_sign=AnqAHm3hJgVoXefXUVCA.pbB5H.MALr.R5OF5JPxibp1yu-eaVRgNawm&test_ipn=1&date_of_month=0&current_number_of_payments=0&preapproval_key=PA-9CF55027AF885735D&ending_date=2011-09-09T23%3A59%3A40.000-07%3A00&approved=true&transaction_type=Adaptive+Payment+PREAPPROVAL&day_of_week=NO_DAY_SPECIFIED&status=ACTIVE&current_total_amount_of_all_payments=0.00&current_period_attempts=0&charset=windows-1252&payment_period=0&notify_version=UNVERSIONED&max_total_amount_of_all_payments=5.00";';
print_r(unserialize($str));